<template>
    <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
    </div>
</template>

<script>
    import {nanoid} from 'nanoid'

    export default {
        name: "Header",
        data() {
            return {
                title: ''
            }
        },
        props: ['func'],
        methods: {
            add() {
                // 校验数据
                if (!this.title.trim())
                    return alert('输入不能为空');
                // 将用户的输入包装成一个 thing 对象
                let thing = {id:nanoid(), title:this.title, done:false};
                // 通知 app 组件去添加一个待办对象
                this.func(thing);
                // 清空输入
                this.title = '';
            }
        }
    }
</script>

<style scoped>
    /*header*/
    .todo-header input {
        width: 560px;
        height: 28px;
        font-size: 14px;
        border: 1px solid #ccc;
        border-radius: 4px;
        padding: 4px 7px;
    }

    .todo-header input:focus {
        outline: none;
        border-color: rgba(82, 168, 236, 0.8);
        box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
    }
</style>